4 #include <linux/rbtree.h>
7 /* bits for the extent state */
8 #define EXTENT_DIRTY (1U << 0)
9 #define EXTENT_WRITEBACK (1U << 1)
10 #define EXTENT_UPTODATE (1U << 2)
11 #define EXTENT_LOCKED (1U << 3)
12 #define EXTENT_NEW (1U << 4)
13 #define EXTENT_DELALLOC (1U << 5)
14 #define EXTENT_DEFRAG (1U << 6)
15 #define EXTENT_BOUNDARY (1U << 9)
16 #define EXTENT_NODATASUM (1U << 10)
17 #define EXTENT_DO_ACCOUNTING (1U << 11)
18 #define EXTENT_FIRST_DELALLOC (1U << 12)
19 #define EXTENT_NEED_WAIT (1U << 13)
20 #define EXTENT_DAMAGED (1U << 14)
21 #define EXTENT_NORESERVE (1U << 15)
22 #define EXTENT_QGROUP_RESERVED (1U << 16)
23 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
24 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
27 * flags for bio submission. The high bits indicate the compression
30 #define EXTENT_BIO_COMPRESSED 1
31 #define EXTENT_BIO_TREE_LOG 2
32 #define EXTENT_BIO_FLAG_SHIFT 16
34 /* these are bit numbers for test/set bit */
35 #define EXTENT_BUFFER_UPTODATE 0
36 #define EXTENT_BUFFER_DIRTY 2
37 #define EXTENT_BUFFER_CORRUPT 3
38 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
39 #define EXTENT_BUFFER_TREE_REF 5
40 #define EXTENT_BUFFER_STALE 6
41 #define EXTENT_BUFFER_WRITEBACK 7
42 #define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
43 #define EXTENT_BUFFER_DUMMY 9
44 #define EXTENT_BUFFER_IN_TREE 10
45 #define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
47 /* these are flags for extent_clear_unlock_delalloc */
48 #define PAGE_UNLOCK (1 << 0)
49 #define PAGE_CLEAR_DIRTY (1 << 1)
50 #define PAGE_SET_WRITEBACK (1 << 2)
51 #define PAGE_END_WRITEBACK (1 << 3)
52 #define PAGE_SET_PRIVATE2 (1 << 4)
53 #define PAGE_SET_ERROR (1 << 5)
56 * page->private values. Every page that is controlled by the extent
57 * map has page->private set to one.
59 #define EXTENT_PAGE_PRIVATE 1
64 struct io_failure_record
;
66 typedef int (extent_submit_bio_hook_t
)(struct inode
*inode
, int rw
,
67 struct bio
*bio
, int mirror_num
,
68 unsigned long bio_flags
, u64 bio_offset
);
69 struct extent_io_ops
{
70 int (*fill_delalloc
)(struct inode
*inode
, struct page
*locked_page
,
71 u64 start
, u64 end
, int *page_started
,
72 unsigned long *nr_written
);
73 int (*writepage_start_hook
)(struct page
*page
, u64 start
, u64 end
);
74 extent_submit_bio_hook_t
*submit_bio_hook
;
75 int (*merge_bio_hook
)(int rw
, struct page
*page
, unsigned long offset
,
76 size_t size
, struct bio
*bio
,
77 unsigned long bio_flags
);
78 int (*readpage_io_failed_hook
)(struct page
*page
, int failed_mirror
);
79 int (*readpage_end_io_hook
)(struct btrfs_io_bio
*io_bio
, u64 phy_offset
,
80 struct page
*page
, u64 start
, u64 end
,
82 int (*writepage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
83 struct extent_state
*state
, int uptodate
);
84 void (*set_bit_hook
)(struct inode
*inode
, struct extent_state
*state
,
86 void (*clear_bit_hook
)(struct inode
*inode
, struct extent_state
*state
,
88 void (*merge_extent_hook
)(struct inode
*inode
,
89 struct extent_state
*new,
90 struct extent_state
*other
);
91 void (*split_extent_hook
)(struct inode
*inode
,
92 struct extent_state
*orig
, u64 split
);
95 struct extent_io_tree
{
97 struct address_space
*mapping
;
101 const struct extent_io_ops
*ops
;
104 struct extent_state
{
106 u64 end
; /* inclusive */
107 struct rb_node rb_node
;
109 /* ADD NEW ELEMENTS AFTER THIS */
110 wait_queue_head_t wq
;
114 struct io_failure_record
*failrec
;
116 #ifdef CONFIG_BTRFS_DEBUG
117 struct list_head leak_list
;
121 #define INLINE_EXTENT_BUFFER_PAGES 16
122 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
123 struct extent_buffer
{
126 unsigned long bflags
;
127 struct btrfs_fs_info
*fs_info
;
128 spinlock_t refs_lock
;
132 struct rcu_head rcu_head
;
135 /* count of read lock holders on the extent buffer */
136 atomic_t write_locks
;
138 atomic_t blocking_writers
;
139 atomic_t blocking_readers
;
140 atomic_t spinning_readers
;
141 atomic_t spinning_writers
;
143 /* >= 0 if eb belongs to a log tree, -1 otherwise */
146 /* protects write locks */
149 /* readers use lock_wq while they wait for the write
150 * lock holders to unlock
152 wait_queue_head_t write_lock_wq
;
154 /* writers use read_lock_wq while they wait for readers
157 wait_queue_head_t read_lock_wq
;
158 struct page
*pages
[INLINE_EXTENT_BUFFER_PAGES
];
159 #ifdef CONFIG_BTRFS_DEBUG
160 struct list_head leak_list
;
165 * Structure to record how many bytes and which ranges are set/cleared
167 struct extent_changeset
{
168 /* How many bytes are set/cleared in this operation */
172 struct ulist
*range_changed
;
175 static inline void extent_set_compress_type(unsigned long *bio_flags
,
178 *bio_flags
|= compress_type
<< EXTENT_BIO_FLAG_SHIFT
;
181 static inline int extent_compress_type(unsigned long bio_flags
)
183 return bio_flags
>> EXTENT_BIO_FLAG_SHIFT
;
186 struct extent_map_tree
;
188 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
194 void extent_io_tree_init(struct extent_io_tree
*tree
,
195 struct address_space
*mapping
);
196 int try_release_extent_mapping(struct extent_map_tree
*map
,
197 struct extent_io_tree
*tree
, struct page
*page
,
199 int try_release_extent_buffer(struct page
*page
);
200 int lock_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
201 struct extent_state
**cached
);
203 static inline int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
)
205 return lock_extent_bits(tree
, start
, end
, NULL
);
208 int try_lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
209 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
210 get_extent_t
*get_extent
, int mirror_num
);
211 int __init
extent_io_init(void);
212 void extent_io_exit(void);
214 u64
count_range_bits(struct extent_io_tree
*tree
,
215 u64
*start
, u64 search_end
,
216 u64 max_bytes
, unsigned bits
, int contig
);
218 void free_extent_state(struct extent_state
*state
);
219 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
220 unsigned bits
, int filled
,
221 struct extent_state
*cached_state
);
222 int clear_record_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
223 unsigned bits
, struct extent_changeset
*changeset
);
224 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
225 unsigned bits
, int wake
, int delete,
226 struct extent_state
**cached
, gfp_t mask
);
228 static inline int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
)
230 return clear_extent_bit(tree
, start
, end
, EXTENT_LOCKED
, 1, 0, NULL
,
234 static inline int unlock_extent_cached(struct extent_io_tree
*tree
, u64 start
,
235 u64 end
, struct extent_state
**cached
, gfp_t mask
)
237 return clear_extent_bit(tree
, start
, end
, EXTENT_LOCKED
, 1, 0, cached
,
241 static inline int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
,
242 u64 end
, unsigned bits
)
246 if (bits
& EXTENT_LOCKED
)
249 return clear_extent_bit(tree
, start
, end
, bits
, wake
, 0, NULL
,
253 int set_record_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
254 unsigned bits
, struct extent_changeset
*changeset
);
255 int set_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
256 unsigned bits
, u64
*failed_start
,
257 struct extent_state
**cached_state
, gfp_t mask
);
259 static inline int set_extent_bits(struct extent_io_tree
*tree
, u64 start
,
260 u64 end
, unsigned bits
)
262 return set_extent_bit(tree
, start
, end
, bits
, NULL
, NULL
, GFP_NOFS
);
265 static inline int clear_extent_uptodate(struct extent_io_tree
*tree
, u64 start
,
266 u64 end
, struct extent_state
**cached_state
, gfp_t mask
)
268 return clear_extent_bit(tree
, start
, end
, EXTENT_UPTODATE
, 0, 0,
272 static inline int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
,
275 return set_extent_bit(tree
, start
, end
, EXTENT_DIRTY
, NULL
,
279 static inline int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
,
282 return clear_extent_bit(tree
, start
, end
,
283 EXTENT_DIRTY
| EXTENT_DELALLOC
|
284 EXTENT_DO_ACCOUNTING
, 0, 0, NULL
, GFP_NOFS
);
287 int convert_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
288 unsigned bits
, unsigned clear_bits
,
289 struct extent_state
**cached_state
);
291 static inline int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
,
292 u64 end
, struct extent_state
**cached_state
)
294 return set_extent_bit(tree
, start
, end
,
295 EXTENT_DELALLOC
| EXTENT_UPTODATE
,
296 NULL
, cached_state
, GFP_NOFS
);
299 static inline int set_extent_defrag(struct extent_io_tree
*tree
, u64 start
,
300 u64 end
, struct extent_state
**cached_state
)
302 return set_extent_bit(tree
, start
, end
,
303 EXTENT_DELALLOC
| EXTENT_UPTODATE
| EXTENT_DEFRAG
,
304 NULL
, cached_state
, GFP_NOFS
);
307 static inline int set_extent_new(struct extent_io_tree
*tree
, u64 start
,
310 return set_extent_bit(tree
, start
, end
, EXTENT_NEW
, NULL
, NULL
,
314 static inline int set_extent_uptodate(struct extent_io_tree
*tree
, u64 start
,
315 u64 end
, struct extent_state
**cached_state
, gfp_t mask
)
317 return set_extent_bit(tree
, start
, end
, EXTENT_UPTODATE
, NULL
,
321 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
322 u64
*start_ret
, u64
*end_ret
, unsigned bits
,
323 struct extent_state
**cached_state
);
324 int extent_invalidatepage(struct extent_io_tree
*tree
,
325 struct page
*page
, unsigned long offset
);
326 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
327 get_extent_t
*get_extent
,
328 struct writeback_control
*wbc
);
329 int extent_write_locked_range(struct extent_io_tree
*tree
, struct inode
*inode
,
330 u64 start
, u64 end
, get_extent_t
*get_extent
,
332 int extent_writepages(struct extent_io_tree
*tree
,
333 struct address_space
*mapping
,
334 get_extent_t
*get_extent
,
335 struct writeback_control
*wbc
);
336 int btree_write_cache_pages(struct address_space
*mapping
,
337 struct writeback_control
*wbc
);
338 int extent_readpages(struct extent_io_tree
*tree
,
339 struct address_space
*mapping
,
340 struct list_head
*pages
, unsigned nr_pages
,
341 get_extent_t get_extent
);
342 int extent_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
343 __u64 start
, __u64 len
, get_extent_t
*get_extent
);
344 void set_page_extent_mapped(struct page
*page
);
346 struct extent_buffer
*alloc_extent_buffer(struct btrfs_fs_info
*fs_info
,
348 struct extent_buffer
*__alloc_dummy_extent_buffer(struct btrfs_fs_info
*fs_info
,
349 u64 start
, unsigned long len
);
350 struct extent_buffer
*alloc_dummy_extent_buffer(struct btrfs_fs_info
*fs_info
,
351 u64 start
, u32 nodesize
);
352 struct extent_buffer
*btrfs_clone_extent_buffer(struct extent_buffer
*src
);
353 struct extent_buffer
*find_extent_buffer(struct btrfs_fs_info
*fs_info
,
355 void free_extent_buffer(struct extent_buffer
*eb
);
356 void free_extent_buffer_stale(struct extent_buffer
*eb
);
358 #define WAIT_COMPLETE 1
359 #define WAIT_PAGE_LOCK 2
360 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
361 struct extent_buffer
*eb
, u64 start
, int wait
,
362 get_extent_t
*get_extent
, int mirror_num
);
363 void wait_on_extent_buffer_writeback(struct extent_buffer
*eb
);
365 static inline unsigned long num_extent_pages(u64 start
, u64 len
)
367 return ((start
+ len
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
) -
368 (start
>> PAGE_SHIFT
);
371 static inline void extent_buffer_get(struct extent_buffer
*eb
)
373 atomic_inc(&eb
->refs
);
376 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
379 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
382 int read_extent_buffer_to_user(struct extent_buffer
*eb
, void __user
*dst
,
385 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
386 unsigned long start
, unsigned long len
);
387 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
388 unsigned long dst_offset
, unsigned long src_offset
,
390 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
391 unsigned long src_offset
, unsigned long len
);
392 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
393 unsigned long src_offset
, unsigned long len
);
394 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
395 unsigned long start
, unsigned long len
);
396 int extent_buffer_test_bit(struct extent_buffer
*eb
, unsigned long start
,
398 void extent_buffer_bitmap_set(struct extent_buffer
*eb
, unsigned long start
,
399 unsigned long pos
, unsigned long len
);
400 void extent_buffer_bitmap_clear(struct extent_buffer
*eb
, unsigned long start
,
401 unsigned long pos
, unsigned long len
);
402 void clear_extent_buffer_dirty(struct extent_buffer
*eb
);
403 int set_extent_buffer_dirty(struct extent_buffer
*eb
);
404 void set_extent_buffer_uptodate(struct extent_buffer
*eb
);
405 void clear_extent_buffer_uptodate(struct extent_buffer
*eb
);
406 int extent_buffer_uptodate(struct extent_buffer
*eb
);
407 int extent_buffer_under_io(struct extent_buffer
*eb
);
408 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
409 unsigned long min_len
, char **map
,
410 unsigned long *map_start
,
411 unsigned long *map_len
);
412 void extent_range_clear_dirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
413 void extent_range_redirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
414 void extent_clear_unlock_delalloc(struct inode
*inode
, u64 start
, u64 end
,
415 struct page
*locked_page
,
416 unsigned bits_to_clear
,
417 unsigned long page_ops
);
419 btrfs_bio_alloc(struct block_device
*bdev
, u64 first_sector
, int nr_vecs
,
421 struct bio
*btrfs_io_bio_alloc(gfp_t gfp_mask
, unsigned int nr_iovecs
);
422 struct bio
*btrfs_bio_clone(struct bio
*bio
, gfp_t gfp_mask
);
424 struct btrfs_fs_info
;
426 int repair_io_failure(struct inode
*inode
, u64 start
, u64 length
, u64 logical
,
427 struct page
*page
, unsigned int pg_offset
,
429 int clean_io_failure(struct inode
*inode
, u64 start
, struct page
*page
,
430 unsigned int pg_offset
);
431 void end_extent_writepage(struct page
*page
, int err
, u64 start
, u64 end
);
432 int repair_eb_io_failure(struct btrfs_root
*root
, struct extent_buffer
*eb
,
436 * When IO fails, either with EIO or csum verification fails, we
437 * try other mirrors that might have a good copy of the data. This
438 * io_failure_record is used to record state as we go through all the
439 * mirrors. If another mirror has good data, the page is set up to date
440 * and things continue. If a good mirror can't be found, the original
441 * bio end_io callback is called to indicate things have failed.
443 struct io_failure_record
{
448 unsigned long bio_flags
;
454 void btrfs_free_io_failure_record(struct inode
*inode
, u64 start
, u64 end
);
455 int btrfs_get_io_failure_record(struct inode
*inode
, u64 start
, u64 end
,
456 struct io_failure_record
**failrec_ret
);
457 int btrfs_check_repairable(struct inode
*inode
, struct bio
*failed_bio
,
458 struct io_failure_record
*failrec
, int fail_mirror
);
459 struct bio
*btrfs_create_repair_bio(struct inode
*inode
, struct bio
*failed_bio
,
460 struct io_failure_record
*failrec
,
461 struct page
*page
, int pg_offset
, int icsum
,
462 bio_end_io_t
*endio_func
, void *data
);
463 int free_io_failure(struct inode
*inode
, struct io_failure_record
*rec
);
464 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
465 noinline u64
find_lock_delalloc_range(struct inode
*inode
,
466 struct extent_io_tree
*tree
,
467 struct page
*locked_page
, u64
*start
,
468 u64
*end
, u64 max_bytes
);
470 struct extent_buffer
*alloc_test_extent_buffer(struct btrfs_fs_info
*fs_info
,
471 u64 start
, u32 nodesize
);